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Deep structural characteristics and seismogenesis of the M≥8.0 earthquakes in North China

Acta Seismologica Sinica(English Edition) 2003年第2期16卷 148-155页

作者：张先张先康刘敏赵丽 researchcenterofexplorationgeophysics ChinaSeismologicalBureau

Based on the results from seismogeological study, aeromagnetic inversion and deep seismic sounding (DSS), it is found that the M8.0 earthquakes in North China have three common deep structural characteristics, i.e., they all took place above the ultra-crustal deep faults or on the edges of the tectonic blocks with higher intensity, and there are low-velocity, low-density and high-conductive layers deep in the epicentral regions. The origins of the earth-quakes are also discussed and the two possibilities of seismogenesis are proposed, i.e., tectonic movement and intracrustal explosion.

关键词： North China M8.0 earthquakes deep structure seismogenesis

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Study of crustal structure with S-wave data from Maqen-Jingbian profile

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Acta Seismologica Sinica(English Edition) 2003年第1期16卷 92-98页

作者：刘宝峰李松林张先康张成科任青芳海燕 researchcenterofexplorationgeophysics ChinaSeismologicalBureau

D crustal velocity structure and vP/vS are obtained by processing and interpretation of S-wave data from Maqen-Jingbian deep seismic sounding (DSS) profile. The result shows that there exist obvious differences in 2-D S-wave velocity structure and vP/vS ratio structure along the profile. The S-wave velocities are low and vP/vS ratio is high for the western section of the profile and Haiyuan region, while they are normal for the middle and eastern sections. The changes in lithologic characters of two major anomalous zones are discussed according to lateral variation of S-wave velocity structure and vP/vS ratio structure. It is concluded that the development and occurrence of the Haiyuan strong earthquake is not only related to tectonic activities, but also to lithologic characters of the region.

关键词： deep seismic sounding velocity structure vP/vS Haiyuan earthquake

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Study on Fine Crustal Structure of the Sanhe-Pinggu Earthquake (M8.0) Region by Deep Seismic Reflection Profiling

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Earthquake Research in China 2003年第2期17卷 122-133页

作者： ZhangXiankang ZhaoJinren LiuGuohua SongWenrong LiuBaojin ZhaoChengbin ChengShuangxi LiuJianda GuMenglin SunZhenguo researchcenterofexplorationgeophysics CSBZhengzhou450002China SeismologicalBureauofJiangsuProvince Nanjing210014China

Two near-vertical deep seismic reflection profiles (140km-long, 24-fold) were completed in the 1679 Sanhe-Pinggu earthquake (M8.0) region. The profiles ran through the Xiadian fault and the Ershilichangshan fault. The profiling result shows that the crust in this region is divided into the upper crust, the lower crust and the crust-mantle transitional zone by two powerful laminated reflectors: one at the two-way travel-time of about 7.0s (21km), the other at about 11.0～12.5s (33～37km). Crustal structure varies significantly in vertical direction. The shallow part is characterized by obvious stratification, multilayers and complexity. The upper crust on the whole features reflection “transparency”, while the lower crust features distinct reflectivity. Crustal structure also varies a lot in the lateral direction. The main fracture in this region is the deep fault under the Xiadian fault. This deep fault is steeply inclined (nearly vertical), and is supposed to be the causative fault of the Sanhe-Pinggu M8.0 earthquake. The two profiles respectively reveal the existence of local strong reflectivity in the lower crust and the lower part of the upper crust, which is assumed to be a dike or rock mass formed by the upwelling and cooling down of materials from the upper mantle. Magmatic activity in this part brought about differences in regional stress distribution, which then gave rise to the formation of the deep fault. That is supposed to be the deep structural setting for the Sanhe-Pinggu M8.0 earthquake.

关键词：强震区深层映射压型结构研究地震源

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